package com.fbs.wowo.util.watermark;

import com.fbs.wowo.exception.DataOverflowException;
import com.fbs.wowo.exception.ErrorCode;
import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.common.BitMatrix;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.HashMap;
import java.util.Map;

/**
 * 生成二维码
 */
public class QrCodeUtil {

/*    public static void main(String[] args) {
        String url = "http://192.168.154.107/dataDetail?essayId=9854014770384338a837cd169e0eb2f0&type=1";
        String path = FileSystemView.getFileSystemView().getHomeDirectory() + File.separator + "testQrcode";
        String fileName = "temp.jpg";
        String qrCode = createQrCode(url, path, fileName);


        File file1 = new File(qrCode);
        if (file1.exists() && file1.isFile()) {
            file1.delete();
            System.out.println("完成success!");
        }
        throw new DataOverflowException(ErrorCode.ERR_FILE_NULL);

    }*/

    public static String createQrCode(String url, String path, String fileName) {
        try {
            Map<EncodeHintType, String> hints = new HashMap<>();
            hints.put(EncodeHintType.CHARACTER_SET, "UTF-8");
            BitMatrix bitMatrix = new MultiFormatWriter().encode(url, BarcodeFormat.QR_CODE, 270, 270, hints);
            File file = new File(path, fileName);

            if (!file.getParentFile().exists()) {
                if (!file.getParentFile().mkdirs()) {
                    throw new DataOverflowException(ErrorCode.ERR_CREATE_QR);
                }
            }
            if (!file.exists()) {
                file.createNewFile();
            }
            writeToFile(bitMatrix, "jpg", file);
            System.out.println("搞定：" + file);
            return file.toString();
        } catch (Exception e) {
            e.printStackTrace();
        }
        throw new DataOverflowException(ErrorCode.ERR_CREATE_QR);
    }

    static void writeToFile(BitMatrix matrix, String format, File file) throws IOException {
        BufferedImage image = toBufferedImage(matrix);
        if (!ImageIO.write(image, format, file)) {
            throw new IOException("Could not write an image of format " + format + " to " + file);
        }
    }

    static void writeToStream(BitMatrix matrix, String format, OutputStream stream) throws IOException {
        BufferedImage image = toBufferedImage(matrix);
        if (!ImageIO.write(image, format, stream)) {
            throw new IOException("Could not write an image of format " + format);
        }
    }

    private static final int BLACK = 0xFF000000;
    private static final int WHITE = 0xFFFFFFFF;

    private static BufferedImage toBufferedImage(BitMatrix matrix) {
        int width = matrix.getWidth();
        int height = matrix.getHeight();
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
            }
        }
        return image;
    }
}
